My wife had a possible bee sting or spider bite last week, redness showed on her right shoulder blade, the next day, redness spread over her entire back, around to sides with stabbing pain on right side, redness faded eventually , but she still has serious pain on right front side near breast, after 10 days, 65 years old, with celiac disease, otherwise in good health. What is it ? blood work last week showed nothing abnormal. She also got a deep tissue massage the same day and soaked in a hot spring, the date it all started!